[juneau-lug] Re: losing permissions

  • From: Jamie <jamie@xxxxxxxxxxxxxxxxx>
  • To: juneau-lug@xxxxxxxxxxxxx
  • Date: Thu, 27 Feb 2014 15:59:01 -0900

Success - I think.  Shortened the rule to just:

KERNEL=="ttyUSB0", MODE="0666"

and it survived a re-boot.


On 02/27/2014 03:26 PM, Jamie wrote:
> Thanks for the tip James.   The first run had the lines:
>> parse_file: reading
>> '/etc/udev/rules.d/91-persistent-weather-usb.rules' as rules file
>> add_rule: invalid KERNEL operation
>> add_rule: invalid rule
>> '/etc/udev/rules.d/91-persistent-weather-usb.rules:14'
>> parse_file: reading
>> '/lib/udev/rules.d/95-keyboard-force-release.rules' as rules file
> and I noticed an example rule used double equal signs so I changed my
> rule to:
> KERNEL=="ttyUSB[0-9]*", GROUP=="dialout", MODE=="0666", ENV{GENERATED}=="1"
> and tried again.  Eliminating that error:
>> parse_file: reading
>> '/etc/udev/rules.d/91-persistent-weather-usb.rules' as rules file
>> parse_file: reading
>> '/lib/udev/rules.d/95-keyboard-force-release.rules' as rules file
> but still not setting my permissions.  Can you help me interpret this
> (from the udevadm test):
>> udev_event_execute_rules: no node name set, will use kernel supplied
>> name 'ttyUSB0'
>> udev_node_add: creating device node '/dev/ttyUSB0', devnum=188:0,
>> mode=0660, uid=0, gid=20
>> udev_node_mknod: preserve file '/dev/ttyUSB0', because it has correct
>> dev_t
>> udev_node_mknod: preserve permissions /dev/ttyUSB0, 020660, uid=0, gid=20
>> node_symlink: preserve already existing symlink '/dev/char/188:0' to
>> '../ttyUSB0'
> This seemed to be the pertinent part, but there's lots more - I just
> don't know what I'm looking for.  Or how to write a udev rule.  BTW this
> machine is running Ubuntu 12.04.04 LTS server.
>
>
>
> On 02/27/2014 11:56 AM, James Zuelow wrote:
>> You say that is a brand new udev rule?  It looks like it should take 
>> priority as long as it is the last one run on the USB ttys and "lastrule" 
>> was not included in an earlier rule.
>>
>> You can test your udev rules.
>>
>> I don't have a USBtty0 on my machine, but here is an example for you to 
>> follow:
>>
>> udevadm info --query=path --name=/dev/ttyUSB0
>>
>> (udev will return a string similar to this)
>> /devices/virtual/tty/ttyUSB0
>>
>> (put the string that udevadm returned above at the end of this command):
>> udevadm test /devices/virtual/tty/ttyUSB0
>>
>> At the bottom of the test output should be a list of rules that udev is 
>> applying, and should give you a clue to which settings are being overridden 
>> or just not applying.
>>
>> James
>>
>>
>>
>>
>> ------------------------------------
>> The Juneau Linux Users Group -- http://www.juneau-lug.org
>> This is the Juneau-LUG mailing list.
>> To unsubscribe, send an e-mail to juneau-lug-request@xxxxxxxxxxxxx with the 
>> word unsubscribe in the subject header.
> ------------------------------------
> The Juneau Linux Users Group -- http://www.juneau-lug.org
> This is the Juneau-LUG mailing list.
> To unsubscribe, send an e-mail to juneau-lug-request@xxxxxxxxxxxxx with the 
> word unsubscribe in the subject header.

------------------------------------
The Juneau Linux Users Group -- http://www.juneau-lug.org
This is the Juneau-LUG mailing list.
To unsubscribe, send an e-mail to juneau-lug-request@xxxxxxxxxxxxx with the 
word unsubscribe in the subject header.

Other related posts:

  1. Home
  2. juneau-lug
  3. Archive
  4. 02-2014